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My wife went to earls and as usual could not finish her Hunan Kung Pao. She got a doggy-bag, which would be more aptly named a boyfriend-bag, which happens to be compostable. So, naturally it begged to be tested. I tore it up and threw it in. I looked for it 3 days later and found a some remnants – a week later it was nowhere to be found. Earls is also source separating their kitchen food scraps at a bunch of locations in the lower mainland and having them sent to an off-site composting facility which is great – most restaurants just chuck food waste in the garbage (and by most I mean 95%).

I am thinking of copying the Blendtec blender infomercials and calling this blog post “Will it Compost”. People can send me thier iPad’s and cell phones and I will see if they will compost…

Yep, the composter ate the compostable diaper. It took over a week – I can only find evidence of a few small shreds of the outer casing still kicking around. We are using cloth diapers in the day and the compostable ones at night. I am going to start to put a couple a day into the unit to see how it keeps up. Unfortunately the diaper mass to food scraps mass we produce at home is too high to possibly put all the compostable diapers in the unit. And yes, the gDiaper at day 3 looks like a cabbage….

Yes, that is right people. I am testing compostable diapers in this high-temperature home composter along with the food scraps. We just had our first baby (a boy) 9 days ago and are trying out a variety of diaper options – one being compostable gDiapers.
Since the composter maintains a temperature of 65C-70C for at least 2 hours, any potential harmful pathogens should be killed, but I am only going to put wet diapers in there to be safe. However, I suspect this smaller composter will not be able to keep up with the sheer number of diapers this little guy is producing (about 10 a day) as they must be too dry. I am going to start with one and see how long it takes to disappear and then ramp it up from there. This should be interesting.

I picked up this compostable food scraps bag called “Bag to Earth” last week made of a kraft paper exterior and cellulose “water retaining” interior.

Compostable Paper and Cellulose Bag

I put wet food scraps in it for 5 days until it was full. Then I took it and put it directly in my in-vessel composter. It has been a few days and there are still traces of it, but I think it will soon be totally composted. Why am I doing this test when I could just scrape my plate into the unit? Imagine putting a larger in-vessel composting unit in the bottom of your condo, then distributing these bags to all the residents for inside their suites.

Inside the Bag to Earth

You put your food scraps into it and every 3 to 5 days, when you are already going down to your car, or recycling room, you throw the whole bag of food scraps into the composter. No plastic bags to remove, and no taking a plastic bin back upstairs or washing – the ultimate in composting convenience for condos and apartments.

An important question about this composting unit is the quality of compost it is making and for what application it is intended for. So I took a sample of the final product (after letting it stabilize outside in a bin for 24 days) to a local testing lab. I told them the end use was intended for a community veggie garden. This is their response:

“Typical of most home compost solutions, the macro-nutrients are high while I would rate the micro-nutrients as being low. While I can appreciate the future for this compost being an incorporated additive for a mineral soil, currently deficient in fertility and organic matter, the excess of macro-nutrients and water-soluble salts will all be reduced from their compost alone status.”

I am not entirely sure how to interpret the last part of the sentence, but speaking with the lab over the phone it sounded like all I had to do was add some iron powder, mix it with a particular type of sand at a 1:1 volume ratio, and it was good to spread on the veggie garden. I guess the proof will be the cucumbers next year.

Note: On request from the manufacturer, I have changed the original title of this post to more accurately reflect the nature of the failure of the composting unit I experienced – a mixing blade broke, but the unit made compost right up to that point. The manufacturer also suggested that too many avocado pits may have caused the blade to break – so it is my negligence that caused it to break. I was also asked to mention that the unit was promptly replaced (as I noted originally in the post) and the new unit is working well and making compost, and that I was generously given the unit for free for product testing purposes – if I did not make that clear enough in the first post (see Let the Testing Begin). I also removed any colourful, subjective adjectives like “concrete”. I also stress that this is a standard consumer product review of my experience and that other consumer’s experiences, of course, may differ. Please be sure to review the comments section after this post to read the response from the director of the company.

Original Post:
Well, unfortunately the condo-sized composter broke itself after 4 months. I opened the lid one day to find a warning light flashing and one of the mixing arms sheared off – which is no small feat considering it is a 10 mm diameter stainless steel rod.

Sheared-off Mixing Blade

After investigation I found that the compost at the bottom of the unit was hard and I had to chip it apart with a screwdriver to empty the unit. I am guessing that if you do not put anything in the composter for a week or so, and the unit goes into energy save mode, the combination of moisture and heat may compact the compost. The unit was replaced by the manufacturer but I think some design changes are required – like maybe the blades should turn at least once every hour to mix the compost, so it does not harden.

So I terminated the composting test after 86 days of adding food waste to the residential sized, in-vessel composting unit. The total mass of food waste that went into the unit over the 86 day period was 30 kg and the total mass removed was 9.2 kg for a mass reduction of 70%. That is a significant amount of organic material diverted from the landfill and certainly will result in reduced waste transportation costs and related carbon emissions for businesses. In this case, I will just go up to the roof in my condo where City Farm Boy is growing veggies and I will add it to his compost pile – 100% organic waste diversion. Also, the unit used a total of $4.76 in electricity over the 86 day period – pretty economical. The manufacturer states a 90% to 95% mass reduction – unfortunately I did not achieve that level. I think the larger, commercial sized units do a better job of breaking down the food waste – I suppose a commercial test demo will have to be done to verify.